perl 查询使用 -pie [英] perl query using -pie

问题描述

这有效:

perl -pi -e 's/abc/cba/g' hellofile

但这不会:

perl -pie 's/cba/abc/g' hellofile

换句话说 -pi -e 有效但 -pie 无效.为什么?

In other words -pi -e works but -pie does not. Why?

推荐答案

-i 标志接受一个可选参数(如果存在，必须紧跟在它之后，而不是在单独的命令中 -行参数)，指定要附加到输入文件的名称以创建备份的后缀.编写 perl -pie 's/cba/abc/g' hellofile 会导致 e 被当作这个后缀，而 e 不是'不会被解释为普通的 -e 选项，Perl 会尝试运行位于 s/cba/abc/g 中的脚本，该脚本可能不存在.

The -i flag takes an optional argument (which, if present, must be immediately after it, not in a separate command-line argument) that specifies the suffix to append to the name of the input file for the purposes of creating a backup. Writing perl -pie 's/cba/abc/g' hellofile causes the e to be taken as this suffix, and as the e isn't interpreted as the normal -e option, Perl tries to run the script located in s/cba/abc/g, which probably doesn't exist.

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